Proposed Resolution: revise section 5.7 as follows.
5.7 Retaining Configured Addresses for Stability
An implementation that has stable storage may want to retain
addresses in the storage when the addresses were acquired using
stateless address autoconfiguration. Assuming the lifetimes used are
reasonable, this technique implies that a temporary outage (less than
the valid lifetime) of a router will never result in the node losing
its global address even if the node were to reboot. When this
technique is used, it should also be noted that the expiration times
of the preferred and valid lifetimes must be retained, in order to
prevent the use of an address after it has become deprecated or
invalid.
Further details on this kind of extension are beyond the scope of
this document.
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